Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf0d8d136525a43…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 19:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb5da5077bbfac29dd8ae47cbbc3ddee SHA-1: 67de44a31637f44433a9585de9003d002005d47c SHA-256: 0cf0d8d136525a43dca2be2f9e359a3220347e6af7a9a0c0d26137472d92ef60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple embedded URLs pointing to potentially compromised or disposable hosting sites. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://artepcb.com/upload/files/51825925057.pdf In PDF document text
    • https://onecre.com/images/content/files/3371489630.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/vepebuv.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/62820944928.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/95824fb1e91868989a99d1898fae441c/nadipogofuboregige.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/99045190774.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/64992613146.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/zuxakokowowumefudot.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/83777883856.pdfIn PDF document text
    • https://linker.tw/files/nipojekitarojejutiwejeti.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vlsdcqft3r29ikjl9mvgba80ah/befobif.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/6356059236.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/21211675760.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/webobikopofaz.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/wabogeworuw.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/rozazesafiludamosiz.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/62017121084.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/44616387886.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/4642731445.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161400fa13baf0---dadejuxawokivube.pdfIn PDF document text
    • http://lj-group.cn/upload/files/lojijokibetaluwa.pdfIn PDF document text
    • http://findusafranchise.com/files/files/24266033190.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/23062886769.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/liromeduxovunozezepaxusez.pdfIn PDF document text
    • https://absoger.bmv-communication.fr/uploads/files/zibovejipesopulozudup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=youtube+update+2021+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000affe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC815 10720 bytes
SHA-256: 153fbc940a4cc5ffe5bd9e46cf3d0b35b748cc4278e784f35718a21798f62b9b
font_02_sfnt_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 15580 bytes
SHA-256: bb7e7426d3262684b8888eb90df53cfc55914b6b1dcce9143b859d9ae49120b2